Gearvendor in a mid -70's C Body?

[Reliabilityman]

I am intending to install a Gear vendor overdrive unit with the 18.5" tail shaft option in my 74 Fury III. Wondering if anyone has done this and if there was floorplan fitment issues or any other issues they encountered so I have a heads up on what to expect.

Thanks in advance

 

[Davea Lux]

On a C-Body, the gear vendor unit should fit in the tunnel as is is, it will be tight though. You may have to fabricate a new support for the transmission and gear vendor unit as the stock one will not clear the overdrive housing. Are you going to 3.55 gears or what is you purpose for installing the overdrive?

Dave

 

[Reliabilityman]

On a C-Body, the gear vendor unit should fit in the tunnel as is is, it will be tight though. You will have to fabricate a new support for the transmission and gear vendor unit as the stock one will not clear the overdrive housing. Are you going to 3.55 gears or what is you purpose for installing the overdrive?

Dave

Thanks Dave, I bought a truck housing and a guy had a 4:33 sure grip posi as well. With the 275/35/R15 tires I will need the overdrive and take advantage of the split gearing the gearvendors has to offer.

 

[twostick]

On a C-Body, the gear vendor unit should fit in the tunnel as is is, it will be tight though. You will have to fabricate a new support for the transmission and gear vendor unit as the stock one will not clear the overdrive housing. Are you going to 3.55 gears or what is you purpose for installing the overdrive?

Dave

I think you have this confused with the A518/RH46 transmission swap.

The GV uses the stock output shaft so the overdrive unit itself would be located behind that. The adapter housing is designed to use the factory mount.

To keep the overall length of the trans as short as possible, I would use a motorhome style trans with the short tailshaft.

727 "SHORTIE" OVERDRIVE TRANSMISSIONS

Kevin

 

[Reliabilityman]

I think you have this confused with the A518/RH46 transmission swap.

The GV uses the stock output shaft so the overdrive unit itself would be located behind that. The adapter housing is designed to use the factory mount.

To keep the overall length of the trans as short as possible, I would use a motorhome style trans with the short tailshaft.

727 "SHORTIE" OVERDRIVE TRANSMISSIONS

View attachment 696513

Kevin

Thanks, unfortunatly I have access to 3 BB long tail shaft 727's. I will have to get the driveshaft shortened and while I am relocating the spring pads (actually welding new spring pads on) from the truck rear end which are on top, to the car rear end style which has the spring pads on the bottom, I may just re-measure the pinion angle and weld the pads on to make a proper angle between the extension the Gear vendors adds to the pinion of the 8-3/4.

 

[twostick]

Thanks, unfortunatly I have access to 3 BB long tail shaft 727's. I will have to get the driveshaft shortened and while I am relocating the spring pads (actually welding new spring pads on) from the truck rear end which are on top, to the car rear end style which has the spring pads on the bottom, I may just re-measure the pinion angle and weld the pads on to make a proper angle between the extension the Gear vendors adds to the pinion of the 8-3/4.

Maybe someone could sell you just the shorter output shaft.

You would probably want to freshen up the trans you were going to use anyway and the output is last thing out when you disassemble it and the first thing in on assembly.

Kevin

 

[Reliabilityman]

Maybe someone could sell you just the shorter output shaft.

You would probably want to freshen up the trans you were going to use anyway and the output is last thing out when you disassemble it and the first thing in on assembly.

Kevin

Yes the tranny is getting an overhaul when I do all this, just wanted to use what I had but may be on the lookout for a short shaft.

 

[Snotty]

Thanks Dave, I bought a truck housing and a guy had a 4:33 sure grip posi as well.

Another guy putting a Chevy rear in a Mopar; shameful!!

 

[Reliabilityman]

Another guy putting a Chevy rear in a Mopar; shameful!!

No its an 8-3/4 mopar truck housing out of a dodge d100. The center section is the 4:33 sure grip

 

[mgm1986]

Following cause one day I'd like to do the same. Please do keep us posted on your project!

 

[Mr C]

No its an 8-3/4 mopar truck housing out of a dodge d100. The center section is the 4:33 sure grip

I think he's teasing at the use of the Chebbie term "posi".

By the way Kip Gardiner put a gear vendors in a 78 NYB Salon without any tunnel clearance issues. He sold the car to someone here, but I cannot remember who....maybe they can roll in.

 

[fury fan]

If you have a smallblock, installing an A518 would be a much simpler route for getting overdrive.
Plus it has a better OD ratio of .69, vs the GV of .78.
4.33 with A518 becomes 2.98, with GV it's 3.37.

If you don't have a smallblock, installing a 5.9 Magnum with A518 might be a better appraoch? (I don't know your car's setup nor your goal for it)

A long-output-shaft assembly of a 727 with a GV is *really* long, longer than shown above, and needs to hang down a bit to get proper driveline angles.
The truck 8-3/4 might not have bosses for installing a pinion snubber.
'Softer' car springs allow an axle to wind up a lot more than stiffer truck springs, and that changes driveline angles.
Combine lack of snubber, short driveshaft and lots of windup when you mash the throttle with 4.33 gears and you might break U-joints sometimes?
And driveline breakage under FT means a failure of the overrunning clutch in a Torqueflight.

 

[Snotty]

No its an 8-3/4 mopar truck housing out of a dodge d100. The center section is the 4:33 sure grip

I understand, but you wrote "posi," which is a Chevy brand name. Limited slip is the axle.